<!--用于管理员登录管理后台，进入后台页面，通过store的dispatch方法对全局状态state进行修改-->
<template>
  <div class="login-container">
    <el-form
      ref="loginForm"
      :model="state.loginForm"
      :rules="rules"
      autocomplete="on"
      class="login-form"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">管理后台</h3>
      </div>
      <el-form-item prop="account">
        <el-input
          ref="account"
          v-model="state.loginForm.account"
          autocomplete="on"
          name="account"
          placeholder="Account"
          tabindex="1"
          type="text"
        />
      </el-form-item>
      <el-tooltip
        v-model="state.capsTooltip"
        content="Caps lock is On"
        manual
        placement="right"
      >
        <el-form-item prop="password">
          <el-input
            :key="state.passwordType"
            ref="password"
            v-model="state.loginForm.password"
            :type="state.passwordType"
            autocomplete="on"
            name="password"
            placeholder="Password"
            tabindex="2"
            @blur="state.capsTooltip = false"
            @keyup="checkCapslock"
            @keyup.enter="handleLogin"
          />
        </el-form-item>
      </el-tooltip>
      <p class="fp" @click="startFp">Forget password</p>
      <el-button
        :loading="state.loading"
        style="width: 100%; margin-bottom: 30px"
        type="primary"
        @click.prevent="handleLogin"
      >
        Login
      </el-button>
    </el-form>
  </div>
</template>

<script lang="ts">
import { ElMessage, ElMessageBox } from 'element-plus';
import { defineComponent, reactive, computed } from 'vue';
import { forgetPassword, login } from '../../api/service';
import { SET_USER } from '../../store';
import { User } from '../../types';
export default defineComponent({
  name: 'Login',
  setup() {
    const validatePassword = (rule: any, value: string, callback: Function) => {
      if (value.length < 6) {
        callback(new Error('The password can not be less than 6 digits'));
      } else {
        callback();
      }
    };
    const state = reactive({
      loginForm: {
        account: '',
        password: '',
      },
      loginRules: {
        account: [{ required: true, trigger: 'blur' }],
        password: [
          {
            required: true,
            trigger: 'blur',
            validator: validatePassword,
          },
        ],
      },
      forgetRules: {
        account: [{ required: true, trigger: 'blur' }],
      },
      passwordType: 'password',
      capsTooltip: false,
      loading: false,
      isFP: false,
    });
    const rules = computed(() => {
      return state.isFP ? state.forgetRules : state.loginRules;
    });
    return { state, validatePassword, rules };
  },
  mounted() {
    if (this.state.loginForm.account === '') {
      (this.$refs.account as HTMLElement).focus();
    }
  },
  computed: {},
  methods: {
    checkCapslock(e: KeyboardEvent) {
      const { key } = e;
      if (key) {
        this.state.capsTooltip = key.length === 1 && key >= 'A' && key <= 'Z';
      }
    },
    handleLogin() {
      this.state.isFP = false;
      (this.$refs.loginForm as HTMLFormElement).validate(
        async (valid: Boolean) => {
          if (valid) {
            this.state.loading = true;
            const req = {
              username: this.state.loginForm.account,
              password: this.state.loginForm.password,
            };
            try {
              const data: any = await login(req);
              const user: User = {
                id: data.id,
                username: data.username,
                avatar: data.avatar,
                email: data.email,
                nickname: data.nickname,
                is_superuser: data.is_superuser
              };
              this.$store.commit(SET_USER, { user });
              window.sessionStorage.userInfo = JSON.stringify(user);
              await this.$router.push({
                path: '/admin',
              });
              this.state.loading = false;
            } catch (e) {
              console.log('err :>> ', e);
              this.state.loading = false;
            }
          }
        }
      );
    },
    startFp() {
      this.state.isFP = true;
      (this.$refs.loginForm as HTMLFormElement).clearValidate();
      this.$nextTick(() => {
        (this.$refs.loginForm as HTMLFormElement).validate((valid: boolean) => {
          if (valid) {
            ElMessageBox.confirm(
              'We will send a new password to ' + this.state.loginForm.account,
              'Tip',
              {
                confirmButtonText: 'OK',
                cancelButtonText: 'Cancel',
                type: 'warning',
              }
            ).then(() => {
              forgetPassword({ account: this.state.loginForm.account }).then(
                (data: any) => {
                  if (!data.error) {
                    ElMessage.success({
                      message: 'success',
                      duration: 1.5 * 1000,
                    });
                  }
                }
              );
            });
          }
        });
      });
    },
  },
});
</script>

<style lang="less" scoped>
.login-container {
  min-height: 100%;
  width: 100%;
  overflow: hidden;
  background-repeat: no-repeat;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  filter: hue-rotate(200deg);
}
.login-form {
  //position: absolute;
  width: 300px;
  max-width: 100%;
  overflow: hidden;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  height: 350px;
}
.tips {
  font-size: 14px;
  color: #fff;
  margin-bottom: 10px;
}
.tips span:first-of-type {
  margin-right: 16px;
}

.svg-container {
  padding: 6px 5px 6px 15px;
  color: #889aa4;
  vertical-align: middle;
  width: 30px;
  display: inline-block;
}
.title-container {
  position: relative;
  color: #333;
}

.title-container .title {
  font-size: 40px;
  margin: 0px auto 40px auto;
  text-align: center;
  font-weight: bold;
}

.show-pwd {
  position: absolute;
  right: 10px;
  top: 7px;
  font-size: 16px;
  color: #889aa4;
  cursor: pointer;
  user-select: none;
}

.thirdparty-button {
  position: absolute;
  right: 0;
  bottom: 6px;
}

.fp {
  font-size: 12px;
  text-align: right;
  margin-bottom: 10px;
  cursor: pointer;
}
</style>
